To use a Gmail account with Mailbox Importer, you must configure firewall proxy to allow Google API network traffic.
For Google API, the following hosts, ports, and protocols allow inbound and outbound traffic:
| Host | Port | Protocol |
|---|---|---|
| *.googleapis.com | 443 & 80 | TCP |
| *.google.com | 443 & 80 | TCP |
| gmail.googleapis.com | 443 & 80 | TCP |